... . material: steel, 3. finish: zinc non-standard flat head socket rivets with internal thread1.Standards:DIN ,ANSI/ASME,BS,GB,JIS,Non ... used on guardrail panel of expressway with mechanical property of Grade 4.8 and 8.8.4. Elevator guide rail bolt and big ... , 316L.6. International internal and external hexagon bolt with the mechanical property of Grade 4.8, 8.8, 10.9 and ANSI ...